Fire-alarm.



T. BELL 31; E. BROPHY.

FIRE ALARM.

APPLICATION FILED JULY 3, 1911.

Patented Mar. 12, 1912.

COLUMBIA PLANOGRAPH c0., WASHINGTON, D. c.

UNITED STATES PATENT GFFICE.

THOMAS BELL, or FALL RIVER, MASSACHUSETTS, AND EDWARD BROPI-IY, or{DIVER-'- TON, nnonn ISLAND.

FIRE-ALARM.

To all whom it may concern:

Be it known that we, THOMAS BELL and EDWARD BRorriY, citizens of theUnited States, residing, respectively, at Fall River,

county of Bristol, and State of Massachusetts, and Tiverton, county ofNewport, and State of Ithode Island, have invented certain new anduseful Improvements in F ire- Alarms, of which the following is aspecification.

Our invention relates to fire alarms.

The object of the present invention is the provision of a light, simple,durable, and inexpensive fire alarm which can be readily placed in anyconvenient location, will require no attention after being so located,and will be adapted to automatically strike a gong or start an electricbell or bells ringing or perform both oilices, whenever the temperaturein the room where the device is located rises above a predetermineddegree.

In carrying out our invention we provide a pivoted lever, rolling ormovable objects carried thereby, which maintain the lever in inoperativeposition, a temperature-expansible or mercury column adapted tocooperate with the lever and by its expansion to tilt the lever, and analarm which is set ofi by the lever: this alarm may be a gong struck bythe lever when it is tilted, or it may be a switch controlling anelectric bell or bells or both.

The following specification sets forth one form the invention may assumebut is to be considered as illustrative, rather than restrictive, of theinvention.

The accompanying drawing illustrates the invention in side elevation,with certain parts in section.

We provide a suitable base 1 of any preferable length from which rises astandard 2 to which is pivoted at 3 a tubular lever 4. The lever 4 couldbe made solid and provided with a tube, if preferred. One end of thelever is provided with a hammer 5 which is adapted to strike a gong 6 onthe base 1 when said lever is tilted. Preferably, the pivot 3 is nearerthe end of the lever which carries the hammer than the other end soSpecification of Letters Patent.

Application filed July 3, 1911.

Patented Mar. 12, 1912. Serial No. 636,759.

that the lever is normally in such position that the hammer is raisedabove the gong. Located within the tubular lever are one or more balls,preferably of metal, 7.

Resting upon the base 1 is a cylinder 8 containing a mercury column 9 orany other liquid which will expand or contract by changes in temperatureon which rests av plunger 10 which fits the cylinder air tight and has astem 11 on which the end of the lever rests when it is in its normalposition with the hammer raised. An electric circuit 12 containing oneor more bells, a battery, and having its terminals connected to the gongand to the pivot 3 may be employed to sound the alarm at any point andto keep it ringing after the initial stroke on the gong due to thefalling of the hammer.

to wish it understood that in carrying out our invention we may use thegong alone, an electrically-controlled alarm whose terminals are closedon the falling of the lever, gr both the gong and the electric circuitand ells.

Normally the hammer is raised due to the weight of the balls beingdisposed at the right hand end of the lever and the latter rests uponthe stem of the plunger. When the temperature unduly rises the mercuryor other column expands, forcing up the piston and its stem and raisingthe right hand end of the lever sufliciently so that the balls roll bygravity to the left hand end of the lever, causing the hammer to quicklystrike a blow on the gong and also to close the electric circuit and setthe electric bells ringing, thus sounding the alarm.

Having thus described our invention, what we claim as new and desire tosecure by Letters Patent, is

In a fire alarm, the combination with a lever pivoted intermediate itsends, of one or more traveling objects carried thereby adapted to movefrom one side of the levers fulcrum to the other side thereof, a mercuryor other expansible liquid column stationarily mounted separate from thelever, a plunger resting on the mercury or liquid column and abuttingagainst the lever whereby on the expansion of the column the Intestimony whereof, We hereunto afliX lever Will be tilted and themovable object our signatures in presence of two Witnesses. 10 orobjects Will travel to the other end of the lever, a mechanical gongwhich is sounded 3 by the lever When the lever tilts, and an electricalarm Whose circuit includes said l/Vitnesses:

gong and is closed by the contact of the lever ABBA N. LINCOLN,therewith. HELEN T. STANFORD.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

